Transcript Forging of Metals - .:روغن سازان شرق

Forging of Metals
Introduction
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A metal is shaped by compressive forces
Oldest metal working process – 4000BC
Can be performed with a hammer and anvil
Typical forged products:
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Bolts
Rivets
Connecting rods
Gears
Lading-gear components for
the C5A and C5B transport
aircraft, made by forging.
Steps involved in forging a bevel
gear with a shaft.
Outline of Forging and Related Operations
Grain Structure
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Parts have good strength
High toughness
Forgings require additional heat treating
Fig : A part made by three different procedures, showing grain flow (a) casting (b) machining (c) forging
Open-Die Forging
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Is the simplest forging process
Sizes can very from very small parts to very large parts
Open-Die Forging
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Upsetting or flat-die forging – a solid workpiece is
placed between flat dies and is compressed
Barreling
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caused by frictional forces at the die-workpiece
interfaces
Can be minimized if a lubricant is used
Thermal effects caused by barreling can be minimized
by using heated dies
Open-Die Forging
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Forging force
Impression-Die & Closed-Die Forging
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The workpiece acquires the shape of the die cavities while
being forged between the two shaped dies
Impression-Die & Closed-Die Forging
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The blank to be forged is prepared by:
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Cutting from a bar stock
Preformed blank
Casting
Preformed blank from prior forging
Impression-Die & Closed-Die Forging
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Fullering & edging are used to distribute the
material
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Fullering – material is distributed away from an area
Edging – material is gathered into an area
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Blocking – rough shaping of the part
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Impression dies – give the part its final shape
Precision Forging
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Used for economic reasons
The part formed is close to the final dimensions
Less machining is needed
Higher capacity equipment is needed
Aluminum and Magnesium alloys work well in the process
Coining
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Closed-die forging process
Used for minting coins, medallions, & jewelry
Lubricants can not be used in coining
Can be used to improve surface finish
THE END